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Pinpoint Test Y: The Low Washer Fluid Indicator Is Never/Always On (If Equipped)

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Instrument Cluster for schematic and connector information.

Normal Operation 

The instrument cluster (IC) provides a reference voltage to the washer fluid switch through circuit CMC20 (VT). The washer fluid switch is grounded through circuit GD123 (BK/GY). When the washer fluid is low, the washer fluid switch closes to ground, pulling the reference voltage low. When the instrument cluster (IC) detects the washer fluid input pulled low, it turns the low washer fluid telltale indicator on.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST Y: THE LOW WASHER FLUID INDICATOR IS NEVER/ALWAYS ON (IF EQUIPPED) 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. Y1 CARRY OUT THE INSTRUMENT CLUSTER (IC) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
    • Select the instrument cluster (IC) low washer fluid indicator (WASHFLLMP) active command and command the low washer fluid indicator on and off. Observe the low washer fluid indicator.
    • Does the low washer fluid indicator illuminate when commanded on, and turn off when commanded off? 
    1. YES  : If the low washer fluid indicator is never on, go to  Y2.

      If the low washer fluid indicator is always on, go to  Y5.

    2. NO  : Go to  Y7.
  2. Y2 CHECK THE LOW WASHER FLUID INDICATOR OPERATION 
    • Key in OFF position.
    • Disconnect: Washer Fluid Level Switch C138
      • Fig 1: Connecting Fused Jumper Wire
      GF0023349Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the washer fluid level switch C138-1, circuit CMC20 (VT), harness side and ground.
    • Key in ON position.
    • Wait one minute.
    • Observe the low washer fluid indicator.
    • Is the low washer fluid indicator on? 
    1. YES  : REMOVE the jumper wire. Go to  Y3.
    2. NO  : REMOVE the jumper wire. Go to  Y4.
  3. Y3 CHECK CIRCUIT GD123 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Measuring Resistance
      GF0023350Courtesy of FORD MOTOR CO.
    • Measure the resistance between the washer fluid level switch C138-2, circuit GD123 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new washer fluid level switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. Y4 CHECK CIRCUIT CMC20 (VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster (IC) C220
      • Fig 3: Measuring Resistance Between Instrument Cluster C220-5, CMC20 (GY/BK) & Washer Fluid Level Switch C138-1
      GF0032219Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster (IC) C220-5, circuit CMC20 (VT), harness side and the washer fluid level switch C138-1, circuit CMC20 (VT), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Y7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. Y5 CHECK THE WASHER FLUID SWITCH 
    • Key in OFF position.
    • Disconnect: Washer Fluid Level Switch C138
    • Key in ON position.
    • Wait one minute.
    • Observe the low washer fluid indicator.
    • Did the low washer fluid indicator turn off? 
    1. YES  : INSTALL a new washer fluid level switch. TEST the system for normal operation.
    2. NO  : Go to  Y6.
  6. Y6 CHECK CIRCUIT CMC20 (VT) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster (IC) C220
      • Fig 4: Measuring Resistance Between Instrument Cluster C220-5, Circuit CMC20 (GY/BK) & Ground
      GF0032220Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster (IC) C220-5, circuit CMC20 (VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Y7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. Y7 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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